I just bought a new 3.8 motor from Tinyrc.com and gear tuning set. The motor will run fine free spining but when on the ground it will not move without a little nudge. Is the torque really low on these cause i put my blue gears (acceleration/power) in and still no go. The axels are new and perfectly clean no particles in the gears. Is this motor faulty or am i doing something wrong or do i just need a new battery upgrade. Any advise or people with the same problem that can help will be much appreciated. Thanx.